-It's difficult for the village children
问题:
-It's difficult for the village children to cross the river for school.
- I think a bridge _________ over the river. [ ]
A. was built
B. is being built
C. should be built
D. has been built
-It's difficult for the village children to cross the river for school.
- I think a bridge _________ over the river. [ ]
A. was built
B. is being built
C. should be built
D. has been built